Marine
The ocean baby
Kelp is a seaweed found in the ocean.
seaweed and bay
Yes it is, learned it in ecology :)
seaweed is something you might find in a starfishes habitat.
seaweed or the ocean floor, same either way
a place with cold water and has lots of seaweed and fish
They probably eat seaweed that grows in their natural habitat.
Under the ocean, blue, seaweed coral etc.
The correct spelling of the adjective is preferable(preferred, desired).
the seahorses' niche is to eat the brine shrimp, phytoplankton and zooplankton in it's habitat (hiding in seaweed) in the sunlight zone.